The third book in Chris Ryan's hugely popular SAS Danny Black series, by the creator of the hit TV show Strikeback.

Readers can't get enough of the Danny Black series:

'Chris Ryan's writing style keeps you gripped . . . I couldn't put this down' Reader review ⭐⭐⭐⭐⭐

'I haven't put this book down, it's a great read' Reader review ⭐⭐⭐⭐⭐

'Chris has you hooked from the first page' Reader review ⭐⭐⭐⭐⭐

'A thrilling story from start to finish' Reader review ⭐⭐⭐⭐⭐

On the Syria-Iraq border, a British hostage is beheaded by IS terrorists. The executioner is a young British extremist. A masked figure watches him - they call him the Caliph.

In Nigeria, the British High Commissioner and his young aide are kidnapped. A four-person SAS team, including hero Danny Black, is deployed to find him, and on arrival they find utter devastation. Prisoners infected with a mysterious plague reveal a plot to unleash a bio-terror attack upon the world - and against a ticking clock, Black and his team must stop the terrorists and identify the Caliph before deadly disease breaks out . . .